On the Possibility of New High Tc Superconductors by Producing metal Heterostructures as in the Cuprate Perovskites

TL;DR

This paper proposes a method to enhance high-temperature superconductivity by engineering metal heterostructures with quantum stripe confinement, tuning their dimensions to achieve resonance conditions that stabilize superconductivity at higher Tc.

Contribution

It introduces a novel approach to increase Tc in superconductors by designing metal heterostructures with specific quantum confinement conditions, demonstrated with Bi2Sr2Ca2Cu2O8+y.

Findings

Resonance condition L λF enhances Tc.

Superlattice structure stabilizes 3D superconductivity.

Parameters for designing higher Tc materials are provided.

Abstract

Here we propose a possible way to produce superconductors with high critical temperature Tc by confinement of a Fermi liquid in a superlattice of quantum stripes (wells, wires or dots). The enhancement of Tc is obtained by tuning the size L of the stripes (wells, wires or dots), and the wavelength of electrons at the Fermi level {\lambda}F at the resonance condition L {\lambda}F. The 3D superconducting phase is stabilized by the condition that the separation W between the stripes (wells, wires or dots) should be of the order of the coherence length {\xi}0. This quantum state is realized in Bi2Sr2Ca2Cu2O8+y superconductor with Tc= 84K, where the resonance condition kFy~2{\pi}/L for the component of the Fermi wavevector normal to the stripe direction holds. This work gives the parameters for the design of new superconducting materials with higher Tc made of metal heterostructures approaching the atomic limit.